# -*- coding: utf-8 -*-
'''
Consul sdb Module

:maintainer:    SaltStack
:maturity:      New
:platform:      all

This module allows access to Consul using an ``sdb://`` URI

Like all sdb modules, the Consul module requires a configuration profile to
be configured in either the minion or master configuration file. This profile
requires very little. For example:

.. code-block:: yaml
    myconsul:
      driver: consul
      host: 127.0.0.1
      port: 8500
      token: b6376760-a8bb-edd5-fcda-33bc13bfc556
      scheme: http
      consistency: default
      dc: dev
      verify: True

The ``driver`` refers to the Consul module, all other options are optional.
For option details see: http://python-consul.readthedocs.org/en/latest/#consul
'''
from __future__ import absolute_import

from salt.exceptions import CommandExecutionError

try:
    import consul
    HAS_CONSUL = True
except ImportError:
    HAS_CONSUL = False


__func_alias__ = {
    'set_': 'set'
}


def set_(key, value, profile=None):
    if not profile:
        return False

    conn = get_conn(profile)

    return conn.kv.put(key, value)


def get(key, profile=None):
    if not profile:
        return False

    conn = get_conn(profile)

    _, result = conn.kv.get(key)

    return result['Value'] if result else None


def get_conn(profile):
    '''
    Return a client object for accessing consul
    '''
    params = {}
    for key in ('host', 'port', 'token', 'scheme', 'consistency', 'dc', 'verify'):
        if key in profile:
            params[key] = profile[key]

    if HAS_CONSUL:
        return consul.Consul(**params)
    else:
        raise CommandExecutionError(
            '(unable to import consul, '
            'module most likely not installed. PLease install python-consul)'
        )
